package com.project.forum.interceptor;

import com.project.forum.config.AppConfig;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 * Created with IntelliJ IDEA.
 * Description:登录拦截器
 * User:DELL
 * Time:10:23
 */
//登录拦截器
@Component
public class LoginInterceptor implements HandlerInterceptor {
    @Value("${bit-forum.login.url}")
    private String defaultURL;
    //前置处理（对请求的预处理）
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //获取session对象
        HttpSession session = request.getSession(false);
        //判断session是否为空
        if (session!=null&&session.getAttribute(AppConfig.USER_SESSION)!=null){
            //用户已经登录，校验通过
            return true;
        }
        //校验URL是否正确
        if (!defaultURL.startsWith("/")){
            defaultURL="/"+defaultURL;
        }
        //校验不通过，用户未登录,跳转到登录页面
        response.sendRedirect(defaultURL);
        //中断流程
        return false;
    }
}
